Article
Engineering, Chemical
Linqiang Zhang, Tongzhou Bai, Qibin Zhao, Xinghua Zhang, Hanlie Cheng, Zhao Li
Summary: With the popularization of natural gas and the requirements for environmental protection, the development and utilization of natural gas is particularly important. Injecting carbon dioxide into the formation can improve the recovery rate of natural gas and achieve carbon neutrality. Injecting greenhouse gases into gas reservoirs for storage and improving recovery has also become a hot research issue.
Article
Geochemistry & Geophysics
Yuqiang Zha, Bao Cao, Fengying Li, Qing Ye, Shaopeng Zhu, Wei Zhou, Runfu Xiong
Summary: This study presents quantitative results of pore structure and permeability variations in unconsolidated sandstone reservoirs during gas displacement using CT reconstruction analysis. The results show that gas displacement increases porosity by enlarging larger pores and throats due to the release and migration of clay and fine particles. The increase in connected pores and larger pore and throat sizes enhances pore connectivity. Permeability improvement after gas displacement is higher than porosity improvement, and gas displacement widens the gas-water flow region and shifts the equal phase relative permeability point to the right.
Article
Energy & Fuels
Ping Yue, Feng Liu, Kai Yang, Chunshuo Han, Chao Ren, Jiangtang Zhou, Xiukun Wang, Quantang Fang, Xinxin Li, Liangbin Dou
Summary: This study evaluated the oil displacement efficiency and storage potential of CO2 in a tight sandstone reservoir. The results showed that the CO2 flooding alternated with water scheme was the most effective in improving crude oil recovery. The remaining oil was mainly found in thin films or dispersed in pores.
Article
Engineering, Chemical
Xiong Liu, Le Yan, Qian Gao, Yafei Liu, Hai Huang, Shun Liu
Summary: Fracture network fracturing combined with oil-water infiltration and replacement is an effective approach to develop tight sandstone reservoirs. This study focuses on the CHANG-7 tight sandstone reservoir in the Changqing oilfield of CNPC and investigates the mechanisms and quantitative characterization of salinity's influence on imbibition oil recovery. The results show that salinity mainly affects the imbibition process through reducing oil-water interfacial tension and constructing an osmotic pressure displacement model. The influence of salinity on interfacial tension can be significant, and it becomes more pronounced with higher differences in salt concentration.
Article
Energy & Fuels
Xiangdong Guo, Min Lv, Hongjun Cui, Kaiyu Lei, Yanyun Lei, Yushuang Zhu
Summary: Based on static geology and dynamic production, this study establishes a convenient method for evaluating the controlled reserves of wells in Yan'an gas field. By applying the method to 88 wells, the productivity and parameter characteristics of the wells are evaluated. The modified flow material balance method is more accurate and applicable. This study provides a new method for evaluating the controlled reserves of tight gas sandstone wells and offers reference values for other evaluating methods.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Jian Tian, Chaozhong Qin, Yili Kang, Lijun You, Na Jia, Jinghan Song
Summary: This study investigates the mechanisms underlying the low water flowback behaviors and formation damages induced by water invasion in tight sandstone gas reservoirs. The research findings reveal that factors such as multiscale pore structures, ultra-low connate water saturation, filling of hydrophilic clay minerals, and insufficient pressure drop contribute to the congenitally unfavorable geological conditions for low water flowback capacity. Additionally, irreversible formation damages caused by water retention, such as water phase trapping, salting out issues, and residual water film effect, restrict water removal during gas-flow drying process.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jiabin Liang, Maxim Lebedev, Boris Gurevich, Christoph Hermann Arns, Stephanie Vialle, Stanislav Glubokovskikh
Summary: The study investigates the pressure dependency of intact sandstone samples using X-ray micro-Computed Tomography imaging and novel deformation detection methods. The results show a high level of accuracy in detecting pressure-induced changes in the elastic properties of the samples. Image segmentation and porosity analysis further confirm the findings, contributing to a better understanding of the mechanical behavior of sandstones under varying pressures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Engineering, Chemical
Xuefei Lu, Xin Xing, Kelai Hu, Bin Zhou
Summary: The strong microscopic heterogeneity of tight sandstone reservoirs makes it difficult to determine the main factors controlling reservoir quality. In this study, a machine learning model was used to classify tight sandstone reservoirs with an accuracy of 86%. This provides an effective method for the comprehensive evaluation of reservoirs.
Article
Chemistry, Physical
Nilesh Kumar Jha, Ahmed Al-Yaseri, Mohsen Ghasemi, Duraid Al-Bayati, Maxim Lebedev, Mohammad Sarmadivaleh
Summary: The study explores the potential of hydrogen storage in saline aquifers through x-ray micro-computed tomography experiments, indicating that up to 65% of sandstone pore volume can be occupied by hydrogen. This finding is significant for addressing the challenges associated with large-scale hydrogen storage.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Geosciences, Multidisciplinary
Wei Cheng, Jing Ba, Jose M. Carcione, Mengqiang Pang, Chunfang Wu
Summary: Tight-sandstone reservoirs with complex pore structures were studied using ultrasonic measurements in the Western Sichuan Basin. Different pressure conditions were examined to estimate porosity and crack properties. The EIAS model was employed to compute moduli and wave properties, showing consistency with available data and indicating the usefulness of 3D rock-physics templates in seismic exploration and prospect evaluation.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Shaoke Feng, Runcheng Xie, Ahmed E. Radwan, Yongfei Wang, Wen Zhou, Wenli Cai
Summary: By using the optimized Gaussian process regression model, this study accurately calculates the porosity of tight sandstone reservoirs, reflecting the characteristics of irreducible water saturation. This has significant implications for the future development of the oil and gas industry.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Stefan Iglauer, Muhammad Ali, Alireza Keshavarz
Summary: This study measured the wettability parameter of hydrogen with rocks under various geo-storage conditions, finding that in a deep sandstone aquifer, the rock (quartz) exhibited weakly water-wet or intermediate-wet characteristics. The research also showed that increasing pressure, temperature, and organic surface concentration can enhance hydrogen wettability. Overall, this study provides fundamental data for the implementation of a future hydrogen economy on an industrial scale.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xiangling Li, Kang Xiao, Ruifeng Wang, Xianbing Li
Summary: Gas injection is an effective method for enhancing oil recovery in low-permeability and tight reservoirs, with the presence of fractures affecting its performance. This study conducted microfluidic experiments using micromodels simulating fractured reservoirs and evaluated the oil displacement effects of different gas injection methods. The simultaneous injection of gas and water showed the highest enhanced oil recovery effect among the tested methods.
Article
Energy & Fuels
Sofiane Haythem Achour, Ryosuke Okuno
Summary: This paper presents a mechanistic simulation study of one-dimensional multicomponent diffusion in a tight reservoir, considering non-ideal interactions, fugacity coefficients, and volume change. The study shows that characterizing the non-ideal behavior of reservoir fluids is crucial for improving early-time flux.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Weiyu Tang, James J. Sheng
Summary: This study examines the effects of different gas injection modes on oil recovery in tight formations with varying permeabilities through experiments and numerical simulations. Results show that gas flooding is more efficient at higher permeabilities, while huff-n-puff injection is superior at lower permeabilities.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jun Wu, Tailiang Fan, Zhiqian Gao, Xinxin Yin, Xue Fan, Chenchen Li, Wenyi Yu, Chen Li, Chenjia Zhang, Jinhuang Zhang, Xining Sun
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2018)
Article
Energy & Fuels
Jun Wu, Tailiang Fan, Zhiqian Gao, Yu Gu, Jiabei Wang, Yang Du, Chen Li, Shanshan Wang, Chenjia Zhang, Miaomiao Meng, Duan Wei, Hua Fan
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2018)
Article
Geosciences, Multidisciplinary
Jun Wu, Tailiang Fan, Enrique Gomez-Rivas, Zhiqian Gao, Shuqing Yao, Wenhuan Li, Chenjia Zhang, Qingqing Sun, Yu Gu, Man Xiang
MARINE AND PETROLEUM GEOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Jun Wu, Tailiang Fan, Enrique Gomez-Rivas, Anna Trave, Zhiqian Gao, Shanshan Wang, Xiaolong Sun
Summary: This study focuses on revealing the pore networks and sealing capacity of the Ordovician carbonate cap rocks in the Tarim Basin. Three classes of cap rocks are defined based on their pore-throat structure, fractal dimension, and sealing capacity, with a strong positive correlation between increasing fractal dimension and sealing performance. Results suggest that the sealing capacity of the studied rocks increases with increasing fractal dimension, while decreasing significantly with an increasing amount of macropores. This work provides a relevant case study for further understanding of pore structures and sealing capacity of carbonate cap rocks.
Article
Geosciences, Multidisciplinary
Qingqing Sun, Tailiang Fan, Zhiqian Gao, Jun Wu, Hehang Zhang, Qi Jiang, Nan Liu, Yaxuan Yuan
Summary: Integrated geological-geophysical methods were used to study the geometric characteristics and kinematic evolution of the Shunbei 5 (SB5) and adjacent Shunbei 1 (SB1) strike-slip faults in the central Tarim Basin, China. The results revealed the initial segmentation, interaction, and polycyclic growth of the fault zones, as well as the formation of favorable fracture-related reservoirs in the study area. The study also identified four major tectonic phases matching the kinematic evolutions of regional fault systems and uplifts in the region, providing insights into the structural evolution of the area.
JOURNAL OF STRUCTURAL GEOLOGY
(2021)